/Engine/Source/Runtime/Experimental/Voronoi/Public/Voronoi/Voronoi.h
All the info you would typically want about a single cell in the Voronoi diagram, in the format that is easiest to compute.
struct FVoronoiCellInfo
TArray< int32 >
Faces
TArray< int32 >
Neighbors
TArray< FVector...
Normals
TArray< FVector...
Vertices